A normal ray refinement technique for Cartesian-grid based Navier–Stokes solvers

Ruffin, StephenM.; Zaki, Mina; Sekhar, Susheel Kumar

doi:10.1080/10618562.2012.691970

Cited by 7 publications

(3 citation statements)

References 27 publications

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“…In prior study of the NRR technique (Ruffin et al 2,3 ), this method was introduced and shown to provide accurate prediction of incompressible, attached viscous flows. In the current study, the NRR approach was demonstrated to provide accurate predictions of separated flow around a circular cylinder using the NASCART-GT flow solver.…”

Section: Discussionmentioning

confidence: 98%

“…Ref. 2 shows the efficiency of the NRR approach in comparison with uniform Cartesian grids. It was shown that NRR is substantially more efficient than uniform Cartesian methods and is its efficiency is comparable to structured approaches.…”

Section: Introductionmentioning

confidence: 99%

“…A Normal Ray Refinement (NRR) technique has been recently proposed by Ruffin et al 2,3 to address this important issue. The objective of the NRR approach is to provide an efficient and largely automated tool for the simulation of flows with viscous boundary layers.…”

Section: Introductionmentioning

confidence: 99%

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Implementation and Evaluation of Normal Ray Refinement Technique in Adaptive Cartesian Framework

Arslanbekov

Kolobov

Ruffin

et al. 2012

42nd AIAA Fluid Dynamics Conference and Exhibit

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This paper describes further enhancement of the Normal Ray Refinement (NRR) technique and its implementation in the adaptive Cartesian framework of the Unified Flow Solver (UFS). Brief introduction to the UFS Navier-Stokes (NS) solver with an Immersed Boundary Method (IBM) is given. Demonstrations are provided of NRR grid generation algorithms based on normal rays with constant and variable refinement on 2D and 3D shapes. Low-and high-order accuracy inter-ray communications methods are implemented in 2Dand results for different shapes are demonstrated and compared to solutions obtained with uniform boundary grids. Capabilities for adaptive normal ray placement are developed in 2D and 3D thus providing ways for NRR automation when fully implemented. Results of flow solution for 2D geometries with statically placed and adaptive normal ray placement show good agreement with uniform boundary layer results. Implementation of the basic framework for NRR over 3D shapes is described and examples are shown. In prior study, the NRR technique was shown to provide accurate prediction of incompressible, attached viscous flows. In the current study the NRR methodology, implemented in NASCART-GT solver, is shown to provide accurate prediction in supersonic flow and low-speed, separated flow around a circular cylinder. It is found that the NRR technique is robustly implementable in different frameworks and it offers significant advantages in terms of greatly reduced number of cells in boundary layers when using Cartesian grids.

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Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%